Improvement in air-heaters



UNITED SrATns PATE-Nr OFFICE..

VILHELM PICKHARDT, OF NEW YORK, N. Y.

IMPROVEMENT IN AIR-HEATERS.

Specification forming part'of Letters Patent No. 212,499', dated February 18,1879 application filed January 3, 1879.

To all whom it may conce/rn:

Be it known that I, WILHELM PrcKHARD'r, of the city, county, and State of New York, have invented a new and useful Improvement in Air-Heaters, which improvement is fully set forth in the following specication, reference being had to the accompanying drawings, in which- Figure l represents a longitudinal vertical section. Fig. 2 is a horizontal section in the plane x w, Fig. l.

Similar letters indicate corresponding parts.

This invention consists in the combination, in an air-heater, of a steam-generator, a steamcoil, a cylinder of sheet metal or other suitable material, which is open at the top and incloses the steam-coil, an air-supply pipe, which extends through the bottom of said cylinder, a closed chamber of brick-work or other bad conductor of heat inclosing the cylinder and the steam-coil, and an air-conducting pipe eX- tending from the side or bottom of said chamber, so that the air which passes through the supply-pipeinto the cylinder becomes heated by contact with the steam-coil; and as it is thereby rareed and caused to rise up, a uniform currentof air is created, which, as it strikes the ceiling of the air-heating chamber, is caused to turn down in the annular space between the cylinder and said chamber, thereby insuring a good circulation; further, in the combination, with the air-heatiu g chamber and with a steamcoil situated therein, of a pipe leading on" from said coil, a secondary coil connected to said pipe, and aWater-tankinclosing said secondary coil, so that the waste steam which escapes from the steam-coil is utilized for heating the water in the tank or boiler.

In the drawings, the letter A designates a steamgenerator, from the steam-space of which extends a pipe, a, to a coil, B. In the example shown in the drawiu this coil is situated in a cylinder, C, of sheet metal or other suitable material, which is open at the top, and connects at its bottom with the air-supply pipe D. Said cylinder is inclosed in a chamber, E, which is built up of brick or other bad conductor of heat, and from the side orbottom of which extends the air-conducting pipe F, leading into the airdistributing chamber G at or near its top. This chamber is provided in its sides, near its bottom, with a series of air-distributin g pipes, H. These pipes, as well as the air-conducting pipe F, are all provided with suitable valves or dampers, for the purpose-of controlling the currents of the heated air.

The escape end of the steam-coil B connects, by a pipe, I, with a coil, J, which is inclosed in a tank or boiler, K, adapted to be filled withl water. From the steam-pipe@ extendsv a small pipe, j', into the upper part of the cylinder'G, so that, when it is desirable, the heated airin this cylinder can be supplied with moisture. The surplus heat from the distributing-chamber can be let off through a pipe, H', into the sewer or chimney.

When steam is passed through the coilB, the air in the cylinder C becomes immediately heated'by contact with the steam-coil and raretied, so that it rises up. By these means a current of air is created through the air-supply pipe D into the cylinder C, and as this air becomes heated and rareed it rises to the ceiling of the air-heating chamber E, whence it is forced down through the annular space between the cylinder C and chamber E into the hot-air-conductiug pipe F, and through this pipe into the collecting-chamber Gr, which it reaches in a highly-heated state, so that it can be used to heat or warm different rooms or compartments in a building by distributing it through the pipes H.

In order to facilitate the passage of the hot air to the air-conducting pipe F, the bottom of the air-heating chamber is made inclined, as shown in Fig. 1.

The fresh air, which is supplied through the supply-pipe D, and heated in the cylinder C, is driven down inside the chamberE and into and down in the collecting-chamber G, for the purpose of obtaining a uniform draft or current.

If desired, the cylinder C in the heatingchamber E can be omitted and the coil B placed directly in said chamber 5 but by the action of the cylinder G a more complete circulation of the air can be effected than can be produced if said cylinder is left out.

The waste steam which escapes from the steam-coil B is utilized for heating the water in the tank or boilerK by circulating it through the coil J infsaid tank.

By my air-heating` apparatus the heated air which is conducted to the several rooms or compartments in a building is as pure and' steam-generator, an air-heating chamber, a'

hot-air-distrilmting,` chamber, situated outside of the air-heating1 chamber, one or more steamcoils inclosed in said air-heating chamber, an air-supply pipe leading into said chamber, and an air-,escape pipe leading` from the bottom of said chamber into the top of .the hot-air-distributing chamber, and air-distributing pipes extending from the lower part of said hot-air distributing chamber, all constructed and adapted to operate substantially as herein shown and described.

2. The combination, in an air-heater, of a steam-coiha cylinder of sheet metal or other suitable material, which is open at the top and incloses the steam-coil, an air supply pipe which extends through the bottom or lower part of said cylinder, a closed chamber of brick-work or other bad conductor of heat inclosing the cylinder and the steam-coil, and an air-conducting pipe extendin g from the side or bottom of said chamber, all constructed and adapted to operate substantially as set forth.

3. The combination, with the air-heating chamber, substantially as described, and with a steam-coil situated therein, of the pipe I, leading,` from said coil, the coil J, connected with said pipe, and the water-tank K, inclosing said coil, essentially as set forth.

4. The combination, with the air-heating* chamber E, air-supply pipe D, and steam-coil B,of a steampipe,j', for moisteningtheheated air in the chamber E, substantially as set forth, i

5. The combination, with the air-heating chamber E, air-supply pipe D, steam-coil B, a I

cylinder, C, and air-conducting pipe F, of an inclined'bottom in the air-heating` chamber E,

substantially as and for the purpose described. In testimony that I claim the foregoing I have hereunto set my hand and 'seal this 31st day ot' December, 1878.

WILHELM PICKHARDT. Witnesses:

W. HAUFF, E. F. KASTENHUBER. 

